Improvement to xref docs
Improvement to xref docs

ggcampinho/elixir,kelvinst/elixir,kelvinst/elixir,lexmag/elixir,ggcampinho/elixir,michalmuskala/elixir,lexmag/elixir,kimshrier/elixir,pedrosnk/elixir,elixir-lang/elixir,kimshrier/elixir,joshprice/elixir,pedrosnk/elixir